首页|High-rate intercity quantum key distribution with a semiconductor single-photon source

High-rate intercity quantum key distribution with a semiconductor single-photon source

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  • 国家科技期刊平台
  • NETL
  • NSTL
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Quantum key distribution(QKD)enables the transmission of information that is secure against general attacks by eavesdroppers.The use of on-demand quantum light sources in QKD protocols is expected to help improve security and maximum tolerable loss.Semiconductor quantum dots(QDs)are a promising building block for quantum communication applications because of the deterministic emission of single photons with high brightness and low multiphoton contribution.Here we report on the first intercity QKD experiment using a bright deterministic single photon source.A BB84 protocol based on polarisation encoding is realised using the high-rate single photons in the telecommunication C-band emitted from a semiconductor QD embedded in a circular Bragg grating structure.Utilising the 79 km long link with 25.49 dB loss(equivalent to 130 km for the direct-connected optical fibre)between the German cities of Hannover and Braunschweig,a record-high secret key bits per pulse of 4.8 x 10-5 with an average quantum bit error ratio of～0.65％are demonstrated.An asymptotic maximum tolerable loss of 28.11 dB is found,corresponding to a length of 144 km of standard telecommunication fibre.Deterministic semiconductor sources therefore challenge state-of-the-art QKD protocols and have the potential to excel in measurement device independent protocols and quantum repeater applications.

Jingzhong Yang、Zenghui Jiang、Frederik Benthin、Joscha Hanel、Tom Fandrich、Raphael Joos、Stephanie Bauer、Sascha Kolatschek、Ali Hreibi、Eddy Patrick Rugeramigabo、Michael Jetter、Simone Luca Portalupi、Michael Zopf、Peter Michler、Stefan Kück、Fei Ding

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Institut für Festkörperphysik,Leibniz Universität Hannover,Appelstraße 2,30167 Hannover,Germany

Institut für Halbleiteroptik und Funktionelle Grenzflächen,Center for Integrated Quantum Science and Technology(IQST)and SCoPE,University of Stuttgart,Stuttgart,Germany

Physikalisch-Technische Bundesanstalt,Braunschweig,Germany

Laboratorium für Nano-und Quantenengineering,Leibniz Universität Hannover,Schneiderberg 39,30167 Hannover,Germany

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German Federal Ministry of Education and Research(BMBF)within the project QR.XGerman Federal Ministry of Education and Research(BMBF)within the project QR.XSQuaDSemIQONEuropean Research CouncilEuropean Research CouncilEuropean Union's Horizon 2020 research and innovation programme(Qurope)EMPIR programme cofinanced by the Participating States and from the European Union's Horizon 2020 research and innovation prograDeutsche Forschungsgemeinschaft(DFG,German Research Foundation)within the project InterSyncGermany's Excellence Strategy(EXC-2123)Quantum FrontiersFlexible Funds programme by Leibniz University HannoverOpen Access funding enabled and organized by Projekt DEAL

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2024

10.1038/s41377-024-01488-0

光:科学与应用(英文版)
中国科学院长春光学精密机械与物理研究所

光:科学与应用(英文版)

CSTPCD
ISSN：2095-5545
年,卷(期)：2024.13(10)